Office (OOXML) / .XLSM malware analysis — malicious · 4d55542e34eec246

MALICIOUS

Office (OOXML) / .XLSM

430.7 KB Created: 2004-08-16 18:44:14 UTC Authoring application: Microsoft Excel 15.0300

MD5: cba8a67b55a9758350ee0bd3c7f33824 SHA-1: f97e681bdf05bae02c3c38c2bd656fe561e54ea0 SHA-256: 4d55542e34eec2465af7785b29aa93097401824fdb682cd8dd0d19141eaefdb6

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1566.002 Spearphishing Attachment T1059.001 PowerShell

The file is an XLSM document containing a Workbook_Open macro, which is a common technique for executing malicious code upon opening. The presence of a CreateObject call and a NOP sled further indicate malicious intent. The document body contains text related to a quote template, suggesting a social engineering lure. The macro likely attempts to download and execute a second-stage payload, though the specific mechanism is not fully detailed in the provided heuristics.

Heuristics 6

NOP sled detected high SC_NOP_SLED

Found 20+ consecutive 0x90 bytes
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
External hyperlinks (1) low OOXML_EXTERNAL_HYPERLINKS

Document contains 1 external hyperlink — clickable URLs are stored as external relationships. First target: https://www.vertex42.com/ExcelTemplates/quote-template.html

URL https://www.vertex42.com/ExcelTemplates/quote-template.html

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `2da6cb393374d4e0ccfa40aec5d1d9d27f8fe72acc7b66aff480aa4ba0ca58d9`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5587 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `d2807a3540f78816e73c285447fcc3fdaa70e385822d9bb5b0bbda3957529a38`	vba-project	OOXML VBA project: xl/vbaProject.bin	25600 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s). Carved macro source contains an auto-exec entry point and execution/download terms.

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